def generate_fdtd(expr, nsolve):
    w = Wild('w')
    expr0 = expr.lhs - expr.rhs
    expr1 = expr0.expand()

        # this doesn't work to collect terms at timestep (n+1)
        print collect(expr1, p[w,w,n+1])

Pardon the unintentional indent, so the function should be:

def generate_fdtd(expr, nsolve):
    w = Wild('w')
    expr0 = expr.lhs - expr.rhs
    expr1 = expr0.expand()

    # this doesn't work
    print collect(expr1, p[w,w,n+1])

Nicholas

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